The 2022 Hunga Tonga-Hunga Ha'apai Eruption, Kingdom of Tonga: Terrain change detected by ALOS-2 data
Terrain change Observed by Synthetic Aperture Radar (SAR)
Hunga Tonga-Hunga Ha'apai volcano, which is located 60 km north of Nukuʻalofa, erupted on Jan. 15, 2022 (UTC). In order to understand terrain changes due to the eruption and the status of Tongatapu island, we analyzed ALOS-2/PALSAR-2 data.
*1 W: ScanSAR (Wide), F: Stripmap (Fine)
(cf. ALOS-2 Project / PALSAR-2 (JAXA))
SAR intensity image of Hunga Tonga-Hunga Ha'apai Volcanic Island
RGB composite image of Tongatapu Island
Fig. 5 RGB composite image (2020-03-07/2022-01-22) [PNG: 919KB]
Fig. 6 RGB composite image(closeup) (2020-03-07/2022-01-22) [PNG: 1MB]
※RGB composite image
We assign the SAR intensity image of the first observation to Green (G) and Blue (B) channels, and that of the second observation to Red channel. If scattering intensity of a specific area decreases in the second observation (e.x. the area has been submerged by the sea), the area is depicted by cyan (GB).
(Additive color process using SAR amplitude images)
Fig. 7 Analysis range
Analysis by GSI from ALOS-2 data of JAXA.
These results were obtained through the activity of the SAR analysis working group of the Coordinating Committee for Prediction of Volcanic Eruption.
ALOS-2 (Advanced Land Observing Satellite 2) launched by Japan Aerospace Exploration Agency on May 24, 2014
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Geography and Crustal Dynamics Research Center
Crustal Deformation Research
MUNEKANE Hiroshi: Head of Division
Space Geodesy Research
KOBAYASHI Tomokazu: Head of Division